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Housing Inventory: Total Listing Count in Williamson County, IL (TOTLISCOU17199)

Observations

Dec 2025: 289
Updated: Jan 12, 2026 12:04 PM CST
Dec 2025:  289  
Nov 2025:  298  
Oct 2025:  291  
Sep 2025:  296  
Aug 2025:  292  

Units:

Level,
Not Seasonally Adjusted

Frequency:

Monthly

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Notes

Title Release Dates
Housing Inventory: Total Listing Count in Williamson County, IL 2020-03-05 2026-01-08
 
Source    
Realtor.com 2020-03-05 2026-01-08
 
Release    
Housing Inventory Core Metrics 2020-03-05 2026-01-08
 
Units    
Level 2020-03-05 2026-01-08
 
Frequency    
Monthly 2020-03-05 2026-01-08
 
Seasonal Adjustment    
Not Seasonally Adjusted 2020-03-05 2026-01-08
 
Notes    
The total of both active listings and pending listings in a given market during the specified month.

2020-03-05 2021-12-01
The total of both active listings and pending listings in a given market during the specified month.

With the release of its November 2021 housing trends report, Realtor.com® incorporated a new and improved methodology for capturing and reporting housing inventory trends and metrics. The new methodology uses the latest and most accurate data mapping of listing statuses to yield a cleaner and more consistent measurement of active listings at both the national and local level. The methodology has also been adjusted to better account for missing data in some fields including square footage. Most areas across the country will see minor changes with a smaller handful of areas seeing larger updates. As a result of these changes, the data released since December 2021 will not be directly comparable with previous data releases (files downloaded before December 2021) and Realtor.com® economics blog posts. However, future data releases, including historical data, will consistently apply the new methodology. More details are available at the source's Real Estate Data Library (https://www.realtor.com/research/data/).

2021-12-02 2022-09-28
The total of both active listings and pending listings in a given market during the specified month.

With the release of its September 2022 housing trends report, Realtor.com® incorporated a new and improved methodology for capturing and reporting housing inventory trends and metrics. The new methodology updates and improves the calculation of time on market and improves handling of duplicate listings. Most areas across the country will see minor changes with a smaller handful of areas seeing larger updates. As a result of these changes, the data released since October 2022 will not be directly comparable with previous data releases (files downloaded before October 2022) and Realtor.com® economics blog posts. However, future data releases, including historical data, will consistently apply the new methodology. More details are available at the source's Real Estate Data Library (https://www.realtor.com/research/data/).

With the release of its November 2021 housing trends report, Realtor.com® incorporated a new and improved methodology for capturing and reporting housing inventory trends and metrics. The new methodology uses the latest and most accurate data mapping of listing statuses to yield a cleaner and more consistent measurement of active listings at both the national and local level. The methodology has also been adjusted to better account for missing data in some fields including square footage. Most areas across the country will see minor changes with a smaller handful of areas seeing larger updates. As a result of these changes, the data released since December 2021 will not be directly comparable with previous data releases (files downloaded before December 2021) and Realtor.com® economics blog posts. However, future data releases, including historical data, will consistently apply the new methodology. More details are available at the source's Real Estate Data Library (https://www.realtor.com/research/data/).

2022-09-29 2026-01-08

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Williamson County, IL Illinois Listing Realtor.com Copyrighted: Citation Required County or County Equivalent Monthly United States of America Not Seasonally Adjusted